Carbureter.



C. L. RAYFIELD. CARBURETER. APPLICATION FILED AUG-28. I9I2.

Patented Apr. 10, 1917.

4 SHEETS-SHEET I.

C. L. RAYFIELD.

'CARBURETER. APPLICATION FILED AUG.28. 1912.

Patented Apr. 10, 1917.

4 SHEETS-SHEET 2.

C. L. RAYFIELD.

CARBURETER. APPLICATION FILED AUG-28. 1912.

1,222, 1-31 0 Patented Apr. 10,1917.

4 SHEETS-SHEET 3- 6 h" 6E o f T J5 w I J v f6 i I M 5* l I IV i I I r C.L. RAYFIELD. CARBURETER. APPLICATION men AUG-28. 1912.

Patented Apr. 10, 1917.

CHARLES L. RAYFIELD, or CHICAGO, ILLINOIS.

CARBURETER.

Specification of Letters Patent.

Patented Apr. It), 191?.

Application filed August 28, 1912. Serial No. 717,541.

To all whom it may concern:

Be it known that 1, CHARLES L. RAYFIELD, a citizen of the United States,and a resident of the city of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inCarbureters; and I do hereby declare that the follow ing is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, and to the numbers of reference marked thereon,which form a part of this specification.

This invention relates to carbureters of that class set forth in myprior application for patent for Carburetors, filed on the 8th day ofDec., 1909, Serial No. 523,114, and in which the mixing chamber receivedits supply of air from ports, some of which are equipped with valves andpositioned to direct the inflowing air to or across the jet of thehydro-carbon as admitted.

In vehicles and in boats the speed is controlled by the operator in partby the throttleor, in other words, by varying the quantity of fluidadmitted into the cylinders of the engine or motor and most carburetersare capable of supplying the requisite amount of mixture to operate suchan engine at any predetermined speed. Variation from this speed eitherto a higher speed or a lower speed tends to vary the richness of themixture and in consequence such engines usually work less perfectly atany other than the speed for which the carbureter was adjusted. This isparticularly true with multicylinder engines whether of the four cycleor two cycle type, owing to the practically constant draft upon thecarbureter for mixture to supply the combustion and with such engines ithas been a matter of great difiiculty heretofore to provide the mixtureas required from a single carbureter. After the carbureter is adjustedfor high speed the constant shifting of the throttle from high speed tolow or vice versa may result in one or more of the cylinders missingfire, indicating loss of efficiency.

Ihe object of this invention is to aiford a carbureter adapted to supplya mixture of practically uniform richness at any and all speeds of theengine or, in other words, in any and all degrees ofopening at thethrottle and whereby adjustment of the valves is effected simultaneouslywith the adjustment of the throttle.

It is also'an object of the invention to afford a construction in whichthe supply of the hydro-carbon fuel and the air supply are regulatedsimultaneously, each with reference to the other to afford a variableand regulable inlet supply of both.

It is also an object of the invention to afford a construction by theuse of which the air supply in the carbureter is mechanically increasedor varied to correspond with the throttle adjustments and to affordmeans for regulating or adjusting the mechanism to enablethe supply andrichness of the mixture to be regulated by means of the throttle to therequirements of the engine at any running speed.

The invention in its preferred form is hereinafter more fullyillustrated and described.

In the drawings:

Figure 1 is a side elevation of a carbureter embodying my invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a central vertical section taken therethroughand showing partsin elevation. I I

Fig. 4 is a section on line ll of Fig. 1.

Fig. 5 is a detail view in elevation of the cam lever for actuating theauxiliary air valve.

Fig. 6 is a section on line 66 of Fig. 1.

Fig. 7 is-a section on line 7-7 of Fig. 1.

Fig. 8 is a view in elevation of theside opposite that shown in Fig. 1.

Fig. 9 is a section on line 99 of Fig. 2.

Fig. 10 is a section on line 10--10 of Fig. 2.

Fig. 11 is a section on line 1111 of Fig. 8.

Figs. 12, 13, 14:, and 15 illustrate a side elevation and sectionaldetails (the latter on lines 1313, and 1515, of Fig. 12) of a modifiedauxiliary valve.

As shown in the drawings:

Said carbureter comprises connected casings 1 and 2, affording a fioatfeed chamber A. and a mixing chamber B. Said chambers, as shown, arecylindric. lhe casing 1, for the float feed chamber comprises cylindr1cside walls, and an integral bottom wall 3, having a central or axialdownwardly d1- rected tubular boss 4, integral with the bottom thereof,and opening upwardly thereinto, and closed at its lower end by means ofa screw plug 5, threaded thereinto, and engage a suitable packing washer6, between the same and the end of said boss to seal the same.

The cover 7, for the float feed chamber, is removably secured thereto,and extending axially through said chamber, and a suitable centralaperture in said cover, is a rod 8, of a length to extend into the borein said boss 4, as shown in Fig. 3, and to normally extend slightlyabove the cover. Adjustably (but rigidly) secured on said rod, is afloat 9, in the present instance shown as constructed of sheet metal,and

having a sleeve 10, extending centrally therethrough, and through whichthe rod 8, extends. Said float feed chamber, is cored from the sideadjacent the mixing chamber, to afford an inward extension C, of thechamber in the space between the same, and

said mixing chamber, and, as shown, the casing of the mixing chamber B,is con-, structed to afford a rearward extension D of the chamberextending over said extension of the float feed chamber C, and to thewall of the float feed chamber.

The bottom of said extension C, of the float feed chamber, is providedwith an aperture therethrough, and threaded therein at its upper end, isa cylindric plug 11, which serves to close the bottom of that portion ofthe float feed chamber and is provided with a central upwardly openingrecess or bore therein, communicating with a restricted central boreextending therethrough, which affords the seat for the inlet needlevalve, through which the flow of the hydro-carbon fuel into the floatfeed chamber is controlled. Said plugis provided on its lower end, witha peripheral downwardly extending internally threaded flange 12, andthreaded thereinto is a hollow connection 13, having a screen 14.,stretched across the top thereof. The induction pipe 15, whereby thegasolene tank communicates with the float feed chamber is threaded intosaid connection 13.

The horizontal partition 16,between the extension D, from the mixingchamber, and the extension C, from the float feed chamber forming thebottom of one and the top of the other is provided with an aperturetherethrough, and threaded therein in alinement with the correspondingseat in the plug 11, is the tubular nozzle or jet pipe 17,

the upper end of which extends above the floor 16, in said extension ofthe mixing chamber and the lower end of which extends below saidpartition 16. Slidably and loosely engaged thereon in the extension C,

of the float feed chamber, is a sleeve 18, which, near its lower end, isrestricted and tapered to a point to afford the valve closure 19, toseat to close the induction passage through the plug 11. Said sleeve 18,is provided with apertures 18 therein slightly above the bottom of thefloat feed chamber, to admit the fluid from said float chamberthereinto, and a peripheral flange 20, is provided on said sleeveintermediate its ends, as shown in Fig. 3. A weak spring 21, is engagedaround said sleeve and bears at its upper end on the wall 16, and at itslower end on said flange to hold the lower needle valve normally closedwhen the float feed chamber is sufliciently full to support the float.

Removably secured in the float feed chamber on the bottom thereof, is abracket 22, and pivotally engaged thereon is a lever 23, the shorter endof which is yoked to engage around the sleeve below the flange 20, andthe longer end of which is provided with an aperture therethrough toreceive the rod 8. As shown, a diametrically apertured ball 24, isrigidly secured on said rod 8, and seats on said longer end of the lever23, to afford a self adjusting bearing for the float on said lever. I

Said plug 11, is provided with a vertical passage 25, extendingdownwardly from its inner end to an annular passage 26, extending aroundwithin the same, and a shaL low cup 27, preferably metallic, and securedon the bottom of the mixing chamber by means of bolts 27*, and spaced adistance therefrom, as shown in Figs. 1 to 3 inclusive, is provided withan integral arm or extenson 28, having a bore therethrough, in whichsaid plug 11, fits closely.

As shown, a packing washer 29, .is provided above and below said arm,and through which said plug extends to seal the joint therebetween. Apassage 30, extends through said arm and communicates with theperipheral passage of said plug and communicating with said passage andextending through said cup or saucer to near the middle of the mixingchamber, is a tubular jet nozzle 31. As shown, a cap screw 32, is set inthe under side of said saucer or cup co-axially with said n0zzle or jet,to afford access thereto for the purpose of cleaning or in assembling.

Integral with the rear wall of the mixing chamber or,'i'n' other words,directed toward the float feed chamber, is a bracket or arm 33, having acylindric seat in the under side thereof co-axial with the bore of thejet nozzle 17 and engaged therein at its upper end, and extendingthrough the top wall 34, of the extension D, of the mixing chamber, is aneedle valve closure 35, for said jet nozzle 17. A spring 36, engaged insaid seat in the arm 38, bears on the upper end of said needle valveclosure to hold the same normally seated.

Journaled in asuitable bearing on the rear wall of the mixing chamber,is a transverse shaft 37, and secured thereon and projecting into a slotin the stem of the needle val've closure 35, is a finger 38, which actswith the rotation of said shaft 37, to raise said needle valve closureagainst the tension of the spring 36.

At the upper end of the casing affording the mixing chamber, is providedan outwardly extending flange 39, which may be apertured to affordengagement with the manifold pipes leading to the engine. Extendingthrough said mixing chamber are parallel shafts 40 and 41, above andbelow the extension D, of the mixing chamber respectively, and rigidlysecured thereon are butterfly valve closures 42 and 43, respectively.The upper butterfly valve closure 42, is slightly cut away on one sidethereof to afford a sufficient passage for the mixtrue to the manifoldpipes to support combustion when the throttle is substantially closed orat its lowest running adjustment.

The lower butterfly valve closure 43, is slotted on its front edge toreceive the jet nozzle 31, therein, as shown in Fig. 3, when the valveis closed, and is also slotted at its opposite side and provided with adownwardly extending boss or projection 44, to which is pivotallyengaged the lower end of a rigid link or connecting rod 45, the upperend of which is pivotally engaged on a corresponding projection 46, onthe upper butterfly valve closure, so that adjustment of one of saidvalves by the rotation of the shaft thereof, necessitates an adjustmentpf 1the other through the medium of said Secured on the outer end of theshaft 40, is the throttle lever 47, whereby said shaft may be rotated,and said butterfly valves adjusted. Alto rigidly secured thereon is arectangular block 48, at the inner side of the throttle lever, andslidably and adjustably secured thereon is a cam 49, comprising camfaces arranged approximately at right angles to each other, and theangle formed thereby cut away to afford a rounded continuation of thecam, as shown in Fig. 9. A screw shaft 50, journaled in the ends of saidcam block, is threaded through said block 48, and extending through anotch in the shaft 40, is provided on its outer end with an adjustingwheel 51, whereby the cam may be shifted on said block with reference toits center of rotation, to-wit, its shaft 40. One end of said screwshaft 50, is milled, and yieldingly engaged in the adjustable cam block,is a spring pressed detent 52, adapted to engage the milled surface ofthe shaft to hold the same in adjusted position.

Loosely engaged on the shaft 37, for adjusting the needle valve closure35, is a downwardly and forwardly extending arm 53, provided at itsforward end with a hearing plate 54, removably secured theredn andengaging said movable cam member 49, and adapted by engagement.therewith to actuate said lever and the shaft 37, to operate said needlevalve. Integral with the arm 53, is a downwardly extending arm providedwith a set screw 56, extending therethrough and rearwardly beyond thesame.

Rigidly secured on said shaft 37, by means of a bracket arm 57, is asleeve 58. Journaled in said sleeve is a shaft 59, having rigidlysecured on the lower end thereof a cam or eccentric 60, which bearsagainst the rearwardly extended end of the set screw 56, to actuate theshaft 37, when the shaft 59, is rotated. Slight movement of the arm 55,on the shaft 37, is afforded, so that rotation of the cam 60 against theadjusting screw serves to swing the lower end of the sleeve 58,rearwardly, thereby elevating the'finger 38, secured on said shaft, andslightly opening the needle valve admitting oil to the extension I), ofthe mixing chamber. ,A lever 61, is rigidly secured on the upper end ofthe shaft 59, to rotate the same, and a rod 62, is pivotally secured tothe extremity of said lever by means of a set screw 63, and extendsrearwardly through a suitable bracket (34, to permit of manualengagement to open said needle valve preparatory to starting theearburation.

Rigidly secured on the shaft 40, at the opposite side of the carbureter,is an arm (35, provided with a set screw 66, adapted to engage on aprojection or lug G7, on the outer wall of the closure, as shown inFig. 1. Said set screws 66 and 68, afford means for adjusting said armto limit the degree of closure of the butterfly valves to the requiredamount to maintain a sufficient supply of the mixture to the motor tomaintain the combustion at the lowest rate of speed of the motor.

A supply of air is provided for each of the inlet jets. As shown, an airinlet port is provided opening into the extension D, of the mixingchamber slightly at the rear thereof, and a. peripheral flange 0rtubular extension 69, in the wall of the casing, is provided around saidport, and extends outwardly substantially flush with the side walls ofthe casing, as shown in Fig. 2, and, as shown, the passage therethroughtapers inwardly to conduct the air in a strong inflowing current or jetagainst the jet of the lIj/(llO-CfllbOfl as it comes from the needlevalve, thus spraying and thoroughly vaporizing the same and carrying thesame therewith iritp the mixing chamber B, between the butterfly valves42 and 43. As shown also, a slight elevation or rib 1'" 0, is providedon the floor of the extension ID, of the mixing chamber, at the pointwhere the same communicates in the main mixing chamber, thereby servingto maintain a thin film of the hydro-carbon fuel on the floor of saidmixing chamber extension to expose a large surface to vaporization.

An air inlet port is also provided to deliver infiowing air to, andacross the top of the jet nozzle 31. For this purpose, as shown, asuitable aperture is provided in the wall of the mixing chamber andthreaded thereinto is .a spider 71, at the hub of which is secured ashaft or stud 72, which extends outwardly therefrom and secured onwhich, and bearing against the hub of the spider, is a relatively strongspiral spring 73, coiled oppositely about which and on the outer sidethereof, is a longer and weaker spiral spring 74. Slidably engaged onsaid stud 72, is a valve closure 75, provided on its inner side with ahub 76, adapted to engage the stronger inner spring 73, and normallyheld from engagement therewith by the weaker spring 74, which engagesagainst said closure.

Threaded upon the outwardly extending annular rim 77, of said spider, isa casing 78, having an outwardly flaring nozzle 79, thereon, as shown inFig. 3, and affording an inner seat against which said closure 75,engages, as shown in Fig. 3, when the air valve is closed.

As shown, theperiphery of said casing is longitudinally grooved on theouter side, and a spring pressed detent 80 is engaged in a suitablebracket or arm 81, secured upon the wall of the mixing chamber, andengages in said longitudinal grooves or recesses to hold said casing inadjusted position. Ofcourse, when the casing is adjusted inwardly, thetension of the springs against the closure 75, is increased thereby,while outward adjustment decreases such pressure, thereby affording alarger supply of air for the mixture.

As shown, a tubular casing or hood 82, closed at its upper end, isthreaded upon a central boss 83, on the cover of the float feed chamberto exclude dust and dirt, therefrom. Said boss, as shown, is also pro-.vided with a vent passage therethrough from the float feed'chamber tovent said chamber against internal pressure. Pivotally engaged in saidhood, and extending through a slot in the side wall thereof, is a bentlever, one arm 84, of which extends over and into position to engage therod 8, when the float feed chamber is filled to normal capacity. Theother end 85, of said lever, extends downwardly on the outer side ofsaid hood, and is engaged by a suitable rod to permit manual anuation,thereby holding the rod 8, with the float thereon, downwardly, until thecarbureter is slightly flooded to facilitate starting the carburation.

A spring 86, is engaged on said lever and acts to hold the arm 84,upwardly out of position to engage said rod, as shown in Fig. 3.

, A regulable auxiliary air valve is provided to afford an additionaland regulable supply of air to maintain the mixture at the desiredrichness at high speeds or with the throttle at any position betweennormal running position of its maximum opening.

For this purpose the upper end of the casing affording the mixingchamber is turned immediately below the flange, whereby the same isadapted to be attached to the manifold pipe to afford an outerperipheral, cylindrical bearing extending to a lower upwardly facingshoulder 87.

A plurality of ports X, open through said easing into the mixing chamberbetween the shoulder and the flange. (These, as shown, are four innumber, though, of course, the number may vary.)

Rotatably mounted on said casing is a 7 split ring 88, which fitsbeneath said flange and is provided with downwardly extending plates89,which are arranged to correspond with said ports in position andnumber and at their lower edge bear upon said shoulder 87, therebysupporting said split ring in place. The ring may, of course, beconstructed in any suitable manner. As shown, it is constructed intoequal segments, each provided with a lug 90, at each end in which engagecap screws or plates to rigidly seciife the same together. Secured onone "side of said ring 88, is a lateral extending arm or projection 91.

Journaled upon the extended end of the shaft 41, is a cam lever 92,which .extends upwardly and rearwardly and is provided therein with anobliquely directed slot Y, to receive the shaft 40 therein whichprotrudes therethrough.

Rigidly but adjustably secured on the extremity of said shaft beyond thecam lever is an arm or lever 93, which, as shown, is provided with asplit hub to receive said shaft and is adapted to be clamped on theshaft by means of a clamping screw 9%. A .stud 95, is secured on theouter or free end of said lever and journaled thereon is a roller 96,which extends into a cam slot Y, in said cam lever, which is directedobliquely with reference to the slot Y. The lower portion of the slot Yis curved concentrically about a point in the forward extremity of theslot Y as a center, which is positioned on the shaft 40, in said slot atits lowest throttle position.

Secured on the upper end of the'cam lever is a fitting 97, having a ballshaped recess or socket therein and secured on the projection or arm 91,of the ring 88, is a corresponding connection 98, also having] a ballsocket therein.

Said connections 97 and 98, are connected by means of the complementallyor male and female threaded rods 99 and 100, each provided at one endwith a ball shaped head adapted to engage in said connections as shownin Figs. 1, 2 and 7, said connecting rod being thus adjustable as tolength to enable the ring 88, to be accurately set to close the portscontrolled thereby when the carbureter is adjusted to lower throttleposition.

The operation is as follows:

The set screw 66, in the arm (35, carried on the shaft a0, is adjustedto limit the closure of the butterfly valves to a position affording thenecessary degree of opening to permit the continued operation of theengine at the lowest possible throttle adjustment to maintain theoperation of the engine at its lowest rate. In this position the needlevalve admitting to the extension in the mixing chamber may be Verynearly quite closed it the carbureter is a multiple jet carbureter, inwhich event the hydro-carbon is supplied from the jet 31, within themixing chamber. When so adjusted an adequate amount of airfor themixture is supplied through the bottom of the mixing chamber or throughthe unvalved port admitting into the extension l), of the iixing chamberor even through the automatic air valve in advance of the jet 31, anadditional source or air supply is or course, not required. Freferably,however, the cam 4C9 is adjusted by means of its screw shaft 50 toafford a degree of opening of said needle valve to supply at least apart or the hydrocarbon for the carburation. The downward pressure uponthe stem of the needle valve exerted by its spring 36. acts to hold thecam 60, in bearing against the said screw 56, thereby holding thebearing plate 54, in

engagement with said cam and the set screw- 56, of course, is adjustedto afford any desired degree of opening of said needle valve at suchposition. Should it be desired to increase the amount of hydro-carbondeliv ered through said needle valve into the extension D, of the mixingchamber, it may be accomplished by rotating the cam 60 by means of thelever 61. This rotates the shaft 37, inasmuch as the arm 53, being heldfrom forward movement of its cam 49, necessitates the rearward swing ofthe sleeve 58, which is rigidly secured on said shaft 37, therebyopening the needlevalve temporarily.

The cam, having been properly set, the rotation of the shaft 40, by thethrottle lever serves to simultaneously open the butterfly valves in themixing chamber and also to further open'said needle valve admittin tothe mixing chamber and up to and inc uding the normal running rate ofthe engine,

til

a suflicient amount of air for the mixture may be admitted through thebottom of the mixing chamber through the automatic valve in the frontofthe mixing chamber and through the open port to the extension I). of themixingchamber for efficient operation.

From the lowest throttle adjustment to the throttle adjustment at whichthe aforesaid air valves and ports become insuiiicient to maintain theproper mixture the lever 93. is moved upwardly in the curved portion ofthe cam slot which, as before stated, is concentric with the shaft l0.at that time, and in consequence no movement whatever of the cam leveris occasioned thereby. 93, is so adjusted on the shaft 40, howcven as toengage in the oblique and relatively straight portion of the cam slot atthat position of the butterfly valves when further opening of thethrottle requires more air for the mixture and in consequence suchfurther opening of the throttle swings said arm upwardly therebyswinging the cam lever forwardly. as shown in Fig. 1, opening the valvescontrolled by said ring 88, to a degree proportional wit the furtheradjustment of the throttle. Inasmuch as the length of the rod connectingthe cam lever with the ring or annular valve closure may be adjusted asdesired, it is obvious that the amount or degree of opening occasionedat of the throttle or at any inte mediate position may be adjusted withthe utmost nicety by varying the length of said connecting rod orproperly adjusting the lever 93, on the shaft l0, or by both. asrequired. so that the richness of the miriture may remain practicallyunaltered under any and all conditions. the quantity only vary" Ofcourse, this construction also permits of such relative adjustment ofthe needle valve admitting to the mixing chamber as to permit themixture to be supplied to the mixing chamber mainly f om the jet 31 orthat Within the mixing chamber when the engine is operated at a low rateand to bring the needle valve admitting to the entension D, of the inletchamber into opera-- full openin .tion when only an additional supply ofthe hydro-carbon may be required above the initial starting rate. Ofcourse, inasmuch. as more or less of the hydro-carbon is usuallycontained upon the floor of the extension D of the mixing chamber andwithin the cup 27., a very large vaporizing surface is afi'orded for thehydro-carbon which serves toprevent any loss through leakage. it is tobe observed that the jets are so disposed that the air inlet to themixing chamber is directed in part across each jet. This greatlyfacilitates vaporizing and mixing, and, inasmuch as the air ports of themixing chamber are arranged on opposite sides The arm l. ll

thereof, the air drawn thereinto passes upward around the mixing chamberinsuring the perfect mixture of all the hydro-carbon admitted.

If preferred the auxiliary air Valve may be constructed to swing insteadof rotate, as shown in Figs. 12 to 13 inclusive, in which the lever 93,engages in a cam slot, eccentrically disposed in a swinging valve plate101, which normally closes a port opening through the wall of the mixingchamber just below the manifold connection. Said lever arm is set toopen said valve when an additional supply of air is received for highspeed operation.

Of course, it is to be understood that I have described but a preferredform of my invention, although numerous details of the construction andoperation may be varied to adapt the invention to carburetors ofdifferent makes than the one to which I have shown the inventionapplied. I therefore do not purpose limiting the patent granted on thisapplication otherwise than necessitated by the prior art.

I claim as my invention:

1. In a carbureter a mixing chamber, a hydrocarbon supply chamber,connected butterfly valves in the mixing chamber, a

throttle lever connected therewith, a needle valve controlling thehydrocarbon flow to the mixing chamber, operative connections betweenthe same and the throttle for actuating the same, an automatic air inletvalve opening into the mixing chamber and between the butterfly valves,and a throttle operated auxiliary air valve mounted on the wall of themixing chamber above said valves and controlling ports therethrough andoperative connections between the same and the throttle valve for openmgthe same progressively as the throttle is opened.

2. In a carbureter a mixing chamber having air ports openingtherethrough and extending peripherallv around adjacent the manifoldconnection, connected valve closures extending circumferentiallv aroundsaid mixing chamber and rotatably movable to control. the opening ofsaid ports, butterfly valves mounted within said mixing chamber, a fuelsupply valve and operative connections between said butterfly valves,said valve closures and said fuel supply valves whereby said closuresare actuated to progressively increase the port openings as saidbutterfly valves are opened, and said fuel valve is alsoprogressivelyopened therewith.

3. In a carbureter a mixing chamber, a plurality of ports openingtherethrough and disposed peripherally therearound adjacent the manifoldconnection, a rotatable closure for said ports, a plurality of butterflyvalves mounted within said mixing chamber, an air inlet to said mixinchamber between said butterfly valves, an automatic valve therefor, oneto control the outlet therefrom and the other to control the inlet ofair thereto, and operative connections between said butterfiy valves andvalve closures whereby the ort openings are varied with the actuation ofsaid butterfly valves.

4. In a carbureter the mixing chamber, a float feed chamber, a needlevalve controlling the connection between the float feed chamber andmixing chamber, a normally open hydrocarbon jet communicating with thefloat feed chamber and delivering upwardly into themixing chamber, a cupsupported below the bottom of the mixing chamber, and through the bottomof which said jet extends, upper and lower connected throttle valvesmounted in the mixing chamher, the one above and the other below the topof said jet, an automatic air valve opening into the mixing chamberbetween said throttle valves, an auxiliary air valve opening into saidmixingchamber near the manifold connection therefor on the posteriorside of the throttle, adjustable connections between said auxiliaryvalve and the throttle mechanism, and connecting to open said auxiliaryvalve progressively with the opening of the throttle valves.

5. In a carbureter of the class described an annular auxiliary airvalve, controlling peripheral openings into the mixing chamber closelyadjacent the manifold connection, butterfly valves controlling the flowthrough said mixing chamber, and operative connections on the exteriorof the carbureter for imparting rotational movement to said auxiliaryvalve with the adjustment of the butterfly valves.

6. In, a device of the class described a mixing chamber, a valvecontrolling the flow of hydro-carbon thereto, valves controlling the airmixed therewith, a valve to control the quantity of mixture flowingthrough said chamber, an annular auxiliary valve disposed around theinterior of said mixing chamber to permit increase in the quantity ofair in the mixture flowing past said latter valve, and operativeconnections between all of said valves for adjustment of all thereof.

7. In a device of the class described a mixing chamber, a valvecontrolling the flow of hydro-carbon thereto, valves for controlling thequantity of air mixed therewith, a throttle valve controlling thequantity of mixture flowing fromsaid chamber, an annular auxiliary airvalve disposed beyond the throttle valve to admit air into the mixturethrough peripheral ports in said mixing chamber after the same haspassed said latter valve, and operative con- 8. In a device of the classdescribed a.

mixing chamberz. a valve controlling the flow of hydro-carbon thereto,valves for controlling the quantity of air mixed therewith, a throttlevalve controlling the quantity of mixture flowingfrom said chamber, anda positively actuatable auxiliary air band valve extendingcirclunfercntially around said mixing chamber to admit air to themixture after the same has passed said throttle valve. l t

9. In a device of the class described a mixing chamber having peripheralports therein, a valve controlling the flow of hydro-carbonthereto,valves for controlling the quantity of, air mixed therewith, a

throttle ,valve controlling, the quantity of mixture flowing from saidchamber, an annular auxiliary air valve extending circumferentiallyaround said mixing chamber controlling said ports to admit air into themixture :after the same has passed, said latter valve, operativeconnections positively actuating each of said valves with actuation ofthe hydro-carbon valve, and means operating said hydro-carbon valveindependently of the other of said valves.

10. In a device. of the class described a mixing chamber, butterflyvalves controlling the inlet and outlet of fluid moving therethrough, ahydro-carbon valve for admitting fuel to said mixing chamber, and anannular auxiliary air valve disposed on the exterior of said mixingchamber connected therewith to open after said hydro-carbon andbutterfly valves have opened a certain amount.

11. In a device of the class described a mixing chamber, inlet andoutlet valves therefor, a hydro-carbonvalve to admit fuel into saidchamber, a supplementary auxiliary air valve disposed peripherallyaround said chamber and disposedbeyond the out- I let valve thereof, andconnections between all of said valves whereby said lattercircumferential valve is actuated into open position after theotherofsaid valves have moved a certain amount toward open position and notbefore.

12. In a carbureter of the class described a mixing chamber, connectedinlet and outlet valves therefor, a plurality of fuel inlets tointroduce the fuel into said mixing chamber, means controlling theflowthrough one of said fuel inlets connected for operation with said inletand outlet valves of the mix ing chamber, and a rotatable auxiliary airinlet valve connected for actuation with said mixing chamber inlet andoutlet valves adapted to introduce air into the carbureter beyond theoutlet valve thereof.

13. In a device of the class described a mixing chamber, a, throttlevalve controlling the flow therefrom, fuel inlets for in-.

troducing fuel into the mixing chamber, a

plurality of air inlets for saidmixing chamber, one normally open andadjacent one of said fuelinlets, an automatic air valve controlling theflow through another of said air inlets, a butterfly valve connected tosaid throttle valv controlling the flow through another of said airinlets, and an auxiliary air inlet for the carbureter disposed beyondsaid throttle valve to. introduce air into the mixture flowing from themixing chamber.

14. In a device of the class described a mixing chamber, inlet andoutlet valves therefor connected to one another fo'rsimultaneousoperation, a plurality of fuel inlets at different levels forintroducing fuel into the mixing chamber, an automatic valve forintroducing fuel into the mixing chamber between the connected inlet andoutlet valves thereof, a normally open air port introducing air into themixing chamber between said connected inlet and outlet valves, and arotatable valve forintroducing air into the carbureter beyond saidoutlet valve thereof and connected for actuation with said connectedinlet and outlet valves.

15. In a carbureter of the class described a mixing chamber, an outletvalve therefor, a plurality of fuel inlets for introducing fuel into themixing chamber, an automatic valve for admitting air into the mixingchamber, a butterfly valve forintroducing air through another inlet intothe mixing chamber,a normally open air port for introducing air into themixing chamber, and an auxiliary air valve for introducing air into themixture flowingpast the outlet valve and connected for operation withsaid outletvalve. 16. In a device of the class described a mixingchamber, an outlet valve therefor, a pluralityof air inlets for saidmixing chamber, an automatic valve controlling the flow through onethereof, another of said inlets normally open and of constant area, abutterfly valve controlling another of said air inlets, meansintroducing fuel into said mixing chamber and 0 eiatlvely connected withthe outlet valve tiiereof, and an auxiliary rotatablevalve for.introducing air into the mixture fiowing past said outlet valve andoperatively connected with said outlet valve and fuel inlet means. v I17. Ina carburetor of the class described the combination with a floatchamber and mixing chamber, of fuel'inlets for introducing fuel from thefloat chamber into mixing chamber at different levels therein, an outletvalve for said mixing chamber, a plurality of air inlets therefor, onenormally open and of constant area and adjacent one of said fuel inlets.another disposed in alinement with the outlet from said mixing chamber,a valve for said latter air inlet. an automatic valve for another ofsaid air inlets for introducing air into the mixing chamber between saidalined inlets and outlets of said mixing Chamber, and a rotatable valvefor intro- 10 ducing air into the carbureter beyond'the throttle valveand connected for operation with the outlet valve of said mixingchamber.

In testimony whereof I have hereunto subscribed my name in the presenceof two subscribing witnesses.

CHARLES L. RAYFIELD.

Witnesses:

CHARLES W. HILLS, Jr., GEORGE R. MOORE.

